Heating pressure always falling to zero!

brodrjam

Hi, anyone know how to fix this recurring problem? :

Every 5 or 6 days I have to top up my pressurised heating system from the mains water. After topping up on Day 1 the heating is fine with pressure up at 2 bar but over the next week it tails off to 0 bar at which point the heat doesnt circulate at all.... i'm not an expert but that doesnt seem right!

Any advise much apprecited

Thanks

Tidyweb

I have the same problem and have tried to get it fixed.
All the plumbers say there is a leak in the system and I will have to just accept it or rip up my floors.
I think there is automatic devices that will repressurise the system.

DGOBS

its called a leak!

check the overflow pipe on the wall outside the boiler, maybe it's leaking (that may indicate another issue)

If not, there is certainly a leak somewhere, you can pressurize and turn off your boiler, leave it off for a day or so with both water isolation valves closed underneath and see if the pressure drops, if not, then the leak is somewhere on your rads/cylinder/pipework, if it does drop then the leak is on the boiler

DONT NOT TURN ON THE BOILER WITH VALVES UNDERNEATH CLOSED

Tidyweb

I have underfloot heating downstairs and radiators upstairs.

Obviously I am fuucckkkeddd if it is downstairs

Otherwise there is nothing obvious. Its a large house could the air or water be compressing to cause a drop in pressure?

Joey the lips

Tidyweb wrote: »

I have the same problem and have tried to get it fixed.
All the plumbers say there is a leak in the system and I will have to just accept it or rip up my floors.
I think there is automatic devices that will repressurise the system.

I would caution you not to do this. Introducing fresh water to a sealed system(assuming the system is sealed) will give more and more problems.

If the pressure is dropping its either

1. A leak
2. The filling loop is letting in.

I would start by isolating circulits every couple of days.

Start with the downstairs rads as this is usually where leaks occur.

brodrjam

i checked the outside vent and yes there has been water flowing, but isnt that supposed to be the case when pressure is too great (ie over 2 bar?)

Looks like i'll have to get the rgi back who installed the boiler in the summer...

More advice please: do i offer to pay his call out charge or should a check for leaks be part of a standard boiler installation?

thanks all

brodrjam

brodrjam wrote: »

i checked the outside vent and yes there has been water flowing, but isnt that supposed to be the case when pressure is too great (ie over 2 bar?)

No, it opens fully at 3 bar and slightly just before.


Looks like i'll have to get the rgi back who installed the boiler in the summer...

brodrjam wrote: »

More advice please: do i offer to pay his call out charge or should a check for leaks be part of a standard boiler installation?

thanks all

Phone the manufactures of the boiler as it's under warranty, your more likely to get a independent opinion.

barneygumble99

had same problem in house im in. only renting a room so wasnt bothered really but as it was the top room, it was last to get the heat and first to lose it. my friend who is a plumber said it could be a small leak somehwere but very hard to find so he fitted an automatic pressure regulating filling valve thing. basically its a tap with a gauge that opens and lets water in when it drops below whatever you set the gauge at, for ours its 2 bar. was less than 100 to have it supplied and fitted. saves letting water into the system every few days and not good for a boiler to be operating at different temperatures i think.